This error is produced when the controller files execute a query string, 
example db(db.usr).select() or db(db.usr).count(). It does not always occur 
but frequently occur!
But after I press F5, it is okay.

Vào 06:17:49 UTC+7 Thứ năm, ngày 26 tháng mười hai năm 2013, Alan Etkin đã 
viết:
>
> In web2py, if I use db = DAL('mssql://...............), the error <class 
>> 'gluon.contrib.pypyodbc.ProgrammingError'> ('', '*SQL_INVALID_HANDLE*') 
>> frequently occurs.
>>
>
> Can you please be more specific? What is the source code in you 
> application producing the error?
>

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